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Derivative Financial Instruments and Hedging Activities - Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Total			$ 292
Interest expense	$ 3,641	$ 3,225	2,566
Operating expenses	1,564	1,522	1,390
Derivatives Designated as Hedges [Member] \| Fair Value Hedging [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps			42
Derivatives Designated as Hedges [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps			3
Derivatives Designated as Hedges [Member] \| Cash Flow Hedging [Member] \| Foreign Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps			121
Derivatives not Designated as Hedges [Member]
Derivatives, Fair Value [Line Items]
Interest rate contracts			40
Foreign currency swaps			86
Operating Expenses [Member]
Derivatives, Fair Value [Line Items]
Total	8	(255)
Operating Expenses [Member] \| Derivatives Designated as Hedges [Member] \| Fair Value Hedging [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Hedged items	0	0
Interest rate swaps and Foreign currency swaps	0	0
Operating Expenses [Member] \| Derivatives Designated as Hedges [Member] \| Fair Value Hedging [Member] \| Foreign Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Hedged items	33	(17)
Interest rate swaps and Foreign currency swaps	(28)	18
Operating Expenses [Member] \| Derivatives Designated as Hedges [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	0	0
Operating Expenses [Member] \| Derivatives Designated as Hedges [Member] \| Cash Flow Hedging [Member] \| Foreign Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	3	(114)
Operating Expenses [Member] \| Derivatives not Designated as Hedges [Member]
Derivatives, Fair Value [Line Items]
Interest rate contracts	0	0
Foreign currency swaps	0	(142)
Interest Expense [Member]
Derivatives, Fair Value [Line Items]
Total	(213)	(77)
Interest Expense [Member] \| Derivatives Designated as Hedges [Member] \| Fair Value Hedging [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Hedged items	(569)	83
Interest rate swaps and Foreign currency swaps	355	(102)
Interest Expense [Member] \| Derivatives Designated as Hedges [Member] \| Fair Value Hedging [Member] \| Foreign Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Hedged items	0	0
Interest rate swaps and Foreign currency swaps	(59)	(5)
Interest Expense [Member] \| Derivatives Designated as Hedges [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	5	14
Interest Expense [Member] \| Derivatives Designated as Hedges [Member] \| Cash Flow Hedging [Member] \| Foreign Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	(87)	(49)
Interest Expense [Member] \| Derivatives not Designated as Hedges [Member]
Derivatives, Fair Value [Line Items]
Interest rate contracts	142	26
Foreign currency swaps	0	(44)
Unrealized (Loss) Gain on Hedges [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Loss	(6)	3	5
(Gains) Losses Reclassified From Accumulated Other Comprehensive Loss Into Income	(3)	(7)	(1)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] \| Fair Value Hedging [Member] \| Foreign Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Loss	(41)	(3)	0
(Gains) Losses Reclassified From Accumulated Other Comprehensive Loss Into Income	41	3	0
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] \| Cash Flow Hedging [Member] \| Foreign Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Loss	(113)	(89)	81
(Gains) Losses Reclassified From Accumulated Other Comprehensive Loss Into Income	64	86	(86)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] \| Derivatives Designated as Hedges [Member]
Derivatives, Fair Value [Line Items]
Gains reclassified from AOCI into income	(26)
AOCI Attributable to Parent [Member]
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Loss	(160)	(89)	86
(Gains) Losses Reclassified From Accumulated Other Comprehensive Loss Into Income	$ 102	$ 82	$ (87)